int main$()$

$\{$

Student s$\{"$Yuri$",$ Stage::starter$\}$;

s$.$printInfo$()$;

auto pS $=$ std::make$\_$unique$("$Ann$",$ Stage::inbetween$)$;

pS$->$printInfo$()$;

$//$had error above having const,so added const in printinfo

Book b$\{"$C$++$ for dummies", $25\mathrm{.}25$f$\}$;

std::cout $<<$ s$.$addBook$($b$)<<$ std::endl;

Book b$2\{"$Advanced C$++",35\mathrm{.}0$f$,$ std::make$\_$shared$("$C in a nutshell", $20\mathrm{.}0$f$)\}$;

std::cout $<<$ s$.$addBook$($b$2)<<$ std::endl;

std::cout $<<$ s$.$listBooks$()$;

std::cout $<<$ s$.$addBook$($b$)<<$ std::endl;

s$.$printInfo$()$;

Student & rS$\{$s$\}$;

rS$.$setStage$($Stage::inbetween$)$;

rS$.$printInfo$()$;

$\}$how can i change the number of copy constructors